28993961 has 8 divisors (see below), whose sum is σ = 30324480. Its totient is φ = 27721716.

The previous prime is 28993949. The next prime is 28993967. The reversal of 28993961 is 16939982.

28993961 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 28993961 - 2¹⁴ = 28977577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28993967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10976 + ... + 13358.

It is an arithmetic number, because the mean of its divisors is an integer number (3790560).

Almost surely, 2^28993961 is an apocalyptic number.

It is an amenable number.

28993961 is a deficient number, since it is larger than the sum of its proper divisors (1330519).

28993961 is an frugal number, since it uses more digits than its factorization.

28993961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452 (or 2406 counting only the distinct ones).

The product of its digits is 209952, while the sum is 47.

The square root of 28993961 is about 5384.6040708672. The cubic root of 28993961 is about 307.2103549716.

The spelling of 28993961 in words is "twenty-eight million, nine hundred ninety-three thousand, nine hundred sixty-one".